When filling out a form, most browsers will cause the form to be submitted if the user's focus is within a single textbox and they hit the Enter key. The specifics of this interaction vary from browser

My fellow experts may be correct, but I'm gonna assume that the problem lies in that it's an <input> tag and get's set as the default. Try adding default="false" to your input type="text". I'm probly crazy!

When filling out a form, most browsers will cause the form to be submitted if the user's focus is within a single textbox and they hit the Enter key. The specifics of this interaction vary from browser to browser. Some older browsers don't cause a submission upon hitting Enter; others older browser only do it if there is precisely one input form field. Modern browsers, however, all pretty much support the Enter acting as form submission, but even then they still exhibit some slight differences.

The URL below provided short description on how the Enter key should affect form submission:

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